test/merge.test.ts

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import { merge } from "../app/utils/merge";

describe("merge", () => {
  test("adds flat properties from source into target", () => {
    const target: any = { a: 1 };
    merge(target, { b: 2 });
    expect(target).toEqual({ a: 1, b: 2 });
  });

  test("overwrites primitive values", () => {
    const target: any = { a: 1, b: "old" };
    merge(target, { b: "new" });
    expect(target).toEqual({ a: 1, b: "new" });
  });

  test("deep-merges nested objects instead of replacing them", () => {
    const target: any = { a: { x: 1 } };
    merge(target, { a: { y: 2 } });
    expect(target).toEqual({ a: { x: 1, y: 2 } });
  });

  test("creates missing nested targets", () => {
    const target: any = {};
    merge(target, { a: { b: { c: 3 } } });
    expect(target).toEqual({ a: { b: { c: 3 } } });
  });
});